I'm trying to terminate 802.1q tagged PPPoE sessions on a 7600 with a
ES+20G card. PPPoE works fine, but large packets (ie: 1500 bytes)
fail. All MTU's are 9216 throughout the path until it hits the ES+20 card.
I did some initial work with this as a test on a 7200, hit the same
problem, and the resolution was the use of ip tcp adjust-mss, however
that does not seem to be working here. I've tried it under gi2/1 as
well, with no luck. Doesn't seem to be an option under 'bba-group' for it
Of course adjusting the mtu on the client pc to something small, like
1400 resolves it, but I'm looking at a mass migration of dsl customers,
so that's not a feasible solution.
Has anyone run into this, before I open a tac case on it?
bba-group pppoe TEST-BBA
virtual-template 1
vendor-tag circuit-id service
vendor-tag remote-id service
vendor-tag dsl-sync-rate service
mac-address autoselect
sessions auto cleanup
!
interface GigabitEthernet2/1
mtu 9216
no ip address
speed 1000
!
interface GigabitEthernet2/1.460 access
description Tnwx-E5111-001
encapsulation dot1Q 460
ip tcp adjust-mss 1400
pppoe enable group TEST-BBA
ip subscriber l2-connected
initiator unclassified mac-address
!
!
interface Virtual-Template1
ip unnumbered Loopback0
no ip proxy-arp
peer default ip address pool BRAS-DSL
ppp authentication chap
!
!
interface Loopback0
ip address xx.xx.xx.1 255.255.255.0
!
---
--
Walter Keen
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